Norbert G. Riedel - 21 Apr 2026 Form 4 Insider Report for Eton Pharmaceuticals, Inc. (ETON)

Reporting relationship: Director
Issuer ticker: ETON
Reported as of: 21 Apr 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 22 Apr 2026, 16:40:35 UTC
Prior SEC filing: 02 Mar 2026
Next SEC filing: 04 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ James R. Gruber

Key filing fact

Norbert G. Riedel filed Form 4 for Eton Pharmaceuticals, Inc. (ETON) on 22 Apr 2026.

Key facts

This page summarizes Norbert G. Riedel's Form 4 filing for Eton Pharmaceuticals, Inc. (ETON).
4 reported transactions and 2 derivative rows are listed below.
Accepted by SEC: 22 Apr 2026, 16:40.

Change

Previous filing in this sequence was filed on 02 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0001161662 Primary reporting owner

RIEDEL NORBERT G

Relationship: Director
Address: C/O ETON PHARMACEUTICALS, INC., 21925 W. FIELD PARKWAY, SUITE 235, DEERPARK
Signature: /s/ James R. Gruber
Signature date: 22 Apr 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

ETON transaction

Common Stock

Options Exercise

Transaction value
Shares: +12,500
Change %: +36%
Price: $7.31^*
Shares after: 47,500
Date: 21 Apr 2026
Ownership: Direct

ETON transaction

Common Stock

Options Exercise

Transaction value
Shares: +19,655
Change %: +41%
Price: $8.61^*
Shares after: 67,155
Date: 21 Apr 2026
Ownership: Direct

ETON holding

Common Stock

No transaction description listed

Transaction value
Shares
Change %
Price
Shares after: 157,145
Date: 21 Apr 2026
Ownership: By Trust
Footnotes: F1

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

ETON transaction Derivative

Employee Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -12,500
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 21 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 12,500
Exercise price: $7.31

ETON transaction Derivative

Employee Stock Option (Right to Buy)

Options Exercise

Transaction value
Shares: -19,655
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 21 Apr 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 19,655
Exercise price: $8.61

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 1 footnote

Footnote F1

Shares held in 'Norbert. G. Riedel 2002 Trust, Loan Thi Tran 2002 Trust' family trust, as to which the Reporting Person is a trustee.

SEC remarks

The reporting person has authorized and designated the named person to file this Form 4 on the reporting person's behalf for indefinite duration.